Kate dazzles in POLKA DOTS during visit to World War 2 codebreaker HQ Bletchley Park

The 37-year-old wore the same £1,750 Alessandra Rich frock she also wore for Prince Charles’ official 70th birthday portraits. Bletchley Park also holds a special personal significance to the Duchess of Cambridge. This is because her paternal grandmother, Valerie Glassborow, helped to decipher the secrets of the German Enigma machine at the site.

During her visit this afternoon, Kate will also meet schoolchildren who will attempt to take on the role of the 1944 codebreakers, by intercepting and deciphering communications.

This is not the first time the duchess has visited Bletchley Park, near Milton Keynes.

She met a group of veteran codebreakers during her last visit to the Buckinghamshire estate in 2014

This included some who worked with her grandmother during the Second World War.